Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add OutlineDriven/outline-driven-development --skill assembly-x86git clone --depth 1 https://github.com/OutlineDriven/outline-driven-developmentWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/outlinedriven/outline-driven-development/assembly-x86)<a href="https://agentmods.dev/skills/outlinedriven/outline-driven-development/assembly-x86"><img src="https://agentmods.dev/badge/skills/outlinedriven/outline-driven-development/assembly-x86/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/outlinedriven/outline-driven-development/assembly-x86"><img src="https://agentmods.dev/badge/skills/outlinedriven/outline-driven-development/assembly-x86.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00048 | $0.01738 |
| Opus 5 | $0.00024 | $0.00869 |
| Sonnet 5 | $0.00010 | $0.00348 |
| Haiku 4.5 | $0.00005 | $0.00174 |
Grade A, and why
assembly-x86 scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 3d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 124 lines — stays where its author put it; the contents beside it link to each section on GitHub.
x86-64 assembly
GCC and Clang emit AT&T syntax by default. This skill reads that output, writes inline asm, and keeps register use inside the System V AMD64 ABI.
Contract
| Field | Bound contract |
|---|---|
| Trigger | The task reads compiler assembly output, writes inline asm in C or C++, decides AT&T versus Intel syntax, or explains calling conventions and stack layout in a disassembly. |
| Authority | Read-only. The skill explains and drafts; edits land through the normal coding path. No remote mutation. |
| Side effect | None. |
| Done | The drafted assembly assembles with gcc -c or clang -c, or the compiler output under discussion is explained register by register. |
Inputs
- The C or C++ source, compiler output, or assembly fragment: required.
- The compiler: required. AT&T versus Intel output and inline asm details follow it.
- The ABI: required. System V for Linux and macOS; the Microsoft x64 ABI changes the register map entirely.
Procedure
- Generate the baseline. Read the compiler's own output before writing any. Done when: the disassembly of the function under discussion is on screen.
gcc -O2 -S -fverbose-asm foo.c -o foo.s
gcc -O2 -c foo.c -o foo.o && objdump -d -M intel foo.o
- Map registers by role. Done when: every register in the fragment is classified.
| Register | 32-bit view | Role |
|---|---|---|
rax |
eax |
Accumulator, 1st return value, caller saved |
rbx |
ebx |
Base, callee saved |
rcx |
ecx |
4th argument, caller saved |
rdx |
edx |
3rd argument, 2nd return value, caller saved |
rsi |
esi |
2nd argument, caller saved |
rdi |
edi |
1st argument, caller saved |
rbp |
ebp |
Frame pointer, callee saved |
rsp |
esp |
Stack pointer |
r8 to r11 |
5th through 8th arguments, caller saved | |
r12 to r15 |
Callee saved | |
rflags |
flags |
Condition codes |
xmm0 to xmm7 |
FP and SIMD arguments and returns | |
xmm8 to xmm15 |
FP and SIMD scratch, caller saved |
What ships with it
2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 3d ago First seen · 124 lines · 48 tokens per session scan A 1422f962b001
assembly-x86 is a skill published in the GitHub repository OutlineDriven/outline-driven-development (52 stars, last pushed 3d ago), licensed Apache-2.0. It adds 48 tokens to every session and 1,738 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-06.
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